Do Autolite spark plugs need to be gapped?
Autolite® and all spark plug manufacturers offer spark plugs pre-gapped in the most popular gap sizes. Because of the many gap sizes required, no one offers spark plugs properly gapped for every application. Gapping has always been the job of the installer.
What should I set my spark plug gap to?
The spark plug gap adjustment should not be changed more than 3 times and should not exceed . 008″ in either direction. Excessive changing of the spark plug gap setting will result in weakening of the spark plug ground electrode and can lead to breakage. Also, the spark plug gap should never exceed .
How do you read Autolite spark plug numbers?
Autolite indicates the heat range with the last digit of the part number. For example, 3923 has a heat range of 3. The higher the number, the hotter the plug. The lower the number, the colder the plug.
What does autolite 25 fit?
Yes, J! This Autolite Copper Resistor Spark Plug – Part # 25 is an exact fit for your 1988 Ford F-150 Pickup 5.0L 302CI.
What do autolite 104 spark plugs fit?
Both these spark plugs part numbers 764 and 104 is an exact fit for your 2003 Ford Mustang GT. The Autolite Copper Core Resistor Spark Plug (Part No. 104) is a projected insulator type spark plug and the spark plug reach is 0.708 inch.
What does autolite AP605 fit?
This Autolite Single Platinum Spark Plug (Part # AP605) is an exact fit for your 2005 Ford Freestar SEL. All the spark plugs are pre-gapped from the factory, the fact remains that the gap must be adjusted for the vehicle that the spark plug is intended for.
What happens if I use a colder spark plug?
A “cold” spark has a shorter insulator and retains less heat at the tip end—but if it’s too cold, deposits accumulate and eventually the plug will short out (known as “fouling”). Spark plug heat range is the relative temperature of the spark plug’s core nose.
What does 2 Step colder spark plugs mean?
2-Step Colder Spark Plugs for BMW N54 Engines These colder spark plugs are recommended for N54’s who are running upgraded turbos or meth injection. Additionally, they may be used for lower horsepower applications if the car is tracked, or driven aggressively for extensive periods of time.
What happens when you run too hot of a spark plug?
If the tip of the spark plug is too hot it can cause pre-ignition leading to detonation/knocking and damage may occur. Heat from the combustion chamber escapes through the exhaust gases, the side walls of the cylinder and the spark plug itself.
Will a hotter spark plug stop fouling?
Rich air/fuel ratios require a hotter plug to prevent fouling. Mixtures that cause the plugs to read lean may contribute to pre-ignition or detonation. The higher the compression ratio, the colder the spark plug needs to be.
Why does my spark plug keep fouling?
Malfunctioning PCV systems are becoming a leading cause of oil fouling in modern engines. This can cause oil to be forced past the valve seals. If the PCV valve is stuck open, the excess vapors and oil droplets can quickly foul the spark plugs. A failed turbocharger can be another source of spark plug oil fouling.
How do you stop a spark plug from fouling?
If you can’t avoid a lot of idling or short trip driving, refer to the spark plug supplier’s catalog for a spark plug that is one heat range HOTTER than the standard spark plugs specified for your engine. Increasing the heat range slightly can improve fouling resistance by helping the plugs run hotter.
Do hotter spark plugs make a difference?
A hotter plug does what is says, it runs hotter. This will not give any more power and neither will a too cold plug. Because the spark plug resides in the combustion chamber, it’s influenced by what happens there. If the current plug is too hot then the tip may be melted or deformed.